How to use the outset option from the inset command?
The Outset option is when you want a new region of faces to appear outside the selection instead of inside. At first I start doing a normal inset on the face and then press O to toggle Outset:



You can see at first new faces are appearing inside until I press O and then new faces appear outside the selection.

Presumably, this simply doesn't work at the minute when there is no geometry outside the selection to outset into.